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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3609e095561aa3ecc45a6f4db211b98ce32303fe10a5dd031172accca38cfb98' 
  AND token = '1p8cTW/GueBJGEBlMZolb7RnTUdnJSUnv83os2zG8R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}